Umbrella frame



FIG. 1 is a perspective view of an umbrella frame showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the umbrella frame shown withenvironment and in the open position; and,

FIG. 9 is a perspective view of the umbrella frame shown withenvironment and in the closed position.

The broken lines depict portions of the article and environment thatforms no part of the claimed design.

CLAIM The ornamental design for an umbrella frame, as shown anddescribed.